Mosync Facebook SDK? Google Play Games?

I stumbled across the MoSync Facebook SDK and was wondering if anyone has been using it.
I couldn’t find anything on here, but it seems like it would be perfect for cocos2d-x. I might give it a shot, unless someone advises against it!

I’m using 2.2.1 btw.

And how about google play games C++ SDK? Anyone use that?

Thanks!
SSL